ALSPAC – Age 15.5 – Wechsler Abbreviated Scale Of Intelligence (WASI)

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The Avon Longitudinal Study of Parents and Children (ALSPAC) assessed their cohort members (CMs) during the study’s age 15.5 sweep (TeenFocus 3) using the Wechsler Abbreviated Scale Of Intelligence (WASI).

Details on this measure and the data collected from the CMs are outlined in the table below.


Domain:Verbal and non-verbal ability
Measures:Verbal Ability
Non-verbal/performance ability
CHC:G (general ability)
Administration method:Trained interviewer; clinical setting; oral answers; pen and paper
Procedure:The WASI is a measure of general cognitive ability designed for use in adults and older adolescents. It is a short-form measure that was developed in tangent with, and designed to provide an estimate of, the full Wechsler Adult Intelligence Scale. It is comprised of four subscales, two verbal and two performance (non-verbal. The two verbal subtests are: i) vocabulary, and ii) similarities. The performance subtests are: i) block design, and ii) matrix reasoning. Each subtest is described individually in the sections below. The WASI provides standard scores (M= 100, SD = 15), on verbal IQ, performance IQ and fullscale IQ. Raw scores are converted into age-adjusted standardized scores using tables provided in the WASI manual. Note that only the vocabulary and matrix reasoning tests were administered at this clinic, and these were used to approximate full IQ score.
Link to questionnaire:http://www.bristol.ac.uk/alspac/researchers/our-data/clinical-measures/ (Opens in new tab)
Scoring:Standardised score (M = 100, SD = 15)
Item-level variable(s):fh6272 - fh6276
Total score/derived variable(s):fh6277 - fh6281
Descriptives:Fullscale IQ
N = 4,955
Range = 55 - 137
Mean = 91.96
SD = 13.00
(click image to enlarge)
Age of participants:Mean = 185.69 months, SD = 4.24, Range = 171 - 212
Other sweep and/or cohort:None
Source:Wechsler, D. (1999). Manual for the Wechsler abbreviated intelligence scale (WASI). San Antonio, TX: The Psychological Corporation.
Technical resources:None
Reference examples:Smithers, L. G., Golley, R. K., Mittinty, M. N., Brazionis, L., Northstone, K., Emmett, P., & Lynch, J. W. (2013). Do dietary trajectories between infancy and toddlerhood influence IQ in childhood and adolescence? Results from a prospective birth cohort study. PLoS One, 8(3), e58904.
Ramsay, H., Barnett, J. H., Murray, G. K., Miettunen, J., Mäki, P., Järvelin, M. R., ... & Veijola, J. (2018). Cognition, psychosis risk and metabolic measures in two adolescent birth cohorts. Psychological medicine, 48(15), 2609-2623.

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This page is part of CLOSER’s ‘A guide to the cognitive measures in five British birth cohort studies’.